I did this specifically so I could keep as great a number of ampoules in stock as possible at any one time, to give me a decent buffer time to sort out new supplies, if ever we can't get them by post as we do now
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This conversion process can be less efficient in individuals with certain genetic mutations or metabolic issues, making Methylcobalamin a more effective option for these populations
However, if you lack IF (the case for people with pernicious anemia
Energy drinks, protein shakes, and certain breakfast cereals may contribute to higher levels, particularly if consumed daily
[6] [65] Since there are few non-animal sources of the vitamin, vegans are advised to consume a dietary supplement or fortified foods for B 12 intake, or risk serious health consequences